Quick detachable hoist



J1me 1964 s. PENNEY ETAL QUICK DETACHA'BLE HOIST 2 Sheets-Sheet 1 Filed March 1, 1963 GEORGE PENNEY NORMAN W. WI LSON INVENTORS June 30, 964 G. PENNEY ETAL 3,139,193

QUICK DETACHABLE HOIST Filed March 1, 1965 2 Sheets-Sheet 2 l l l l l l I I I HA" E474 GEORGE PEN NEY NORMAN W. WILSON INVENTOR.

BYWM

ATTY

United States Patent O 2 Claims. (Cl. 21477) This application is a substitute for our application filed August 4, 1961, Serial No. 129,357.

The invention herein shown and described relates to new and useful improvements in hoists adapted, though not restrictively so, for use on truck bodies and the like and has for its principle object to provide a hoist of this character which is of simple, efiicient, durable all welded construction and one which may be quickly and conveniently attached to or detached from any sturdy component of the truckstructure such for example asthe rear bumper thereof.

Another object of the invention is to provide a hoist of the character described which is operable by a standard hydraulic jack which is readily applicable to the hoist or removable therefrom when desired or necessary.

A further object is the provision of a hoist capable of lifting heavy loads with minimum effort on the part of the operator and which may be conveniently manipulated for placing the load in any desired location within or upon the truck body.

The foregoing and other objects and advantages which will become subsequently apparent reside in the details of construction and operation as more fully hereinafter described and claimed, reference being had to the accompanying drawingsforming, a part hereof and in which:

FIGURE 1 is a rear elevational view of a truck equipped with a hoist made in accordance with our invention.

FIGURE 2 is an elevational view of the hoist on an enlarged scale and rotated through 90 of a circle from the position shown in FIGURE 1.

FIGURE 2A is a fragmentary detail view on an enlarged scale of the free end of the hoist boom.

FIGURE 3 is a sectional top plan view taken approximately along the line 33 of FIGURE 2 on an enlarged scale.

FIGURE 4 is a side elevational view of FIGURE 3.

FIGURE 5 is a fragmentary sectional detail view taken approximately along the line 55 of FIGURE 3.

FIGURE 6 is a detail view of a jack-anchoring means, and FIGURE 7 is a side elevational view of FIGURE 6.

With continuing reference to the drawings wherein like references of character designate like parts and particularly FIGURES 1 and 2 thereof, reference numeral 1 indicates generally a truck body which may be of the pick-up type having a tail gate 2 and a top 3. The truck is provided with a rear bumper 4 of the so called wrap-around type made of channel section bent at a right angle at both of its ends. The tail gate is hinged to the bottom wall of the truck body as at 5 in the conventional manner.

The hoist comprises a turret in the form of a circular plate 7 having a concentric sleeve bearing 8 integrated with its underside and extending downwardly through aligned openings 9 and 10 in upper and lower gussets 11 and 12 welded to and interconnecting respectively the top and bottom flanges of one of the rearwardly bent ends 13 of the bumper 4. The top end of the bearing 8 is welded as at 14 to the underside of the gusset 11.

The top end of a pivot shaft 15, journalled in the sleeve bearing 8, extends upwardly through a boom pivot plate 16 and into the bottom half of a boom pivot mounting 3,139,198 Patented June 30, 1964 block 17 Whose bottom end is welded as at 18 to the plate 16 near one end thereof and to the shaft 15 as at 19. A clevis 20 is hingedly attached by a pin 21 to the block 17 and integrated at its top end with a boom centering shaft 22 extending upwardly into the bottom end of the boom indicated generally at 25, and which comprises a tubular member 26 shaped as shown in FIGURES 1 and 2 and provided with a reinforcing rib 27 extending substantially throughout its length. The free end of the boom is provided with aring member 28 for the reception of a chain or cable as indicated at 30 in FIGURE 1 or a hook (not shown) could be attached to the member 28 for handling loads indicated generally at 31 in FIGURE 1. The boom pivot plate is reinforced by parallel ribs 16A, and the boom pivot mounting block 17 is reinforced by a gusset 17A.

From the foregoing it will be readily apparent that the boom 25 through the medium of the boom pivot plate 16 and pivot shaft 15 can be rotated through 360 of a circle and that the boom itself can be swung in a vertical plane, regardless of the position of the boom pivot plate, from a position as indicated by broken lines in FIGURE 2 where its freeend can be resting upon the bottom wall of the truck body to an elevated position in the proximity of that shown in full lines.

Integrated with the boom 25 near the bottom end thereof is a horizontally disposed jack plate 35 reinforced on its underside by a gusset 36 welded to the plate and to the boom as at 37 and 38 respectively. The jack plate 35 is further reinforced by diagonal gussets 39 welded at their bottom end to the jack plate as at 40 and at their top end to the boom as at 41 (see FIG. 2).

A standard hydraulic jack indicated generally at 42 and operable by a jack handle (not shown) is held seated on the jack plate 35 by means of cables or chains 43 attached at their bottom end to clevises 45 welded as at 46 to the boom pivot plate 16. The top ends of the chains 43' are attached to eyes 48 welded as at 49 to opposite sides of a jack pad 54)" having a central downwardly opening recess 52 shouldered as at 53 for the reception of a ring 54 welded in place as at 55.

The jack 42 may be a standard hydraulic type preferably, though not restrictively, of five-ton capacity having a ram or piston shaft 61) provided with a threadedly adjustable extension 61 adapted for insertion through the ring 54 and into the recess 52. The ram 60, and hence the jack pad 50 is operable from the retracted position shown in broken lines in FIGURE 2 to the full line extended position shown therein.

As clearly shown in FIGURES 1-4, the clevises 45 are offset from the boom pivot 21 and also from. the thrust line of the jack ram 60. As a consequence thereof, outward movement of the ram 66 from the retracted position shown in broken lines in FIGURE 2 will exert a pulling force on the chains 43 which will be reacted against by the clevises 45 and transmitted through the jack body 42 and jack plate 35 to the boom 25 above and to one side of the boom pivot 21. The triangle of forces and the magnitude thereof thus applied to the boom with the jack plate acting as a lever arm and the boom pivot as a fulcrum will provide the boom with abundant lifting power for any loads the truck may be capable of carrying.

The easy swivel action of the boom pivot plate 16 enables an operator to conveniently spot a load on the truck body after the load has been elevated to clear the bottom wall of the body.

Although we have shown and described the turret and its related parts secured to one of the curved ends of a bumper by means of gussets it will be readily understood that the sleeve bearing 8 of the turret could be extended through and secured to the flanges of a bumper made of straight channel section.

Also, we do not wish to be limited to a hydraulic jack as herein shown and described since obviously mechanical jacks of the screw type and the like could be used just as effectively.

The embodiments of the invention in which an exclusive property or privilege is claimed are defined as follows:

1. A hoist of the character described, comprising in combination,

a turret,

a vertically disposed sleeve bearing mounting said turret to flanges of a vehicle bumper of channel section,

a pivot shaft journalled in said sleeve bearing and extending upwardly through said turret,

a boom pivot plate secured at one of its ends to said pivot shaft for rotation therewith,

a boom of generally arcuate shape in side elevation and having a top end and a bottom end,

means hingedly mounting the bottom end of the boom to said boom pivot plate,

a jack,

means removably supporting said jack on said boom near said bottom end thereof in offset relation thereto and to said hinged boom mounting means,

a ram operable by said jack,

non-elastic means interconnecting said ram and the opposite end of said boom pivot plate at a point more remote from said jack support whereby the triangle of forces applied to the boom through the lever arm characteristic of said offset jack supporting means will impart upward swinging movement of the boom relative to said bumper and whereby a load suspended from said top end of the boom may be lowered onto or lifted from the body of a vehicle to which said bumper is secured.

2. A combination hoist and vehicle bumper,

said bumper being of channel section and bent at a right angle at least at one of its ends,

upper and lower gussets secured to and interconnecting respectively the top and bottom flanges of said bent end of the bumper,

wardly through the aligned openings in said circular and boom pivot plates and secured to the latter,

a vertical disposed boom pivot mounting block secured at its bottom end to said extended top end of said pivot shaft and to said boom pivot plate,

a boom of generally arcuate shape in side elevation and having a top end and a bottom end,

means hingedly mounting the bottom end of the boom to said boom pivot mounting block,

a plate secured to said boom superjacent said bottom end thereof and extending outwardly at a right angle therefrom,

a vertically disposed jack supported upon said plate,

a ram operable by the jack,

a jack pad straddling said ram and extending outwardly from both sides thereof,

non-elastic means interconnecting said jack pad and said boom pivot plate, and the connection of said non-elastic means with said boom pivot plate being offset from said boom pivot mounting block and from the vertical axis of said jack and ram, whereby the triangle of forces applied to the boom through the lever arm characteristic of said jack supporting plate will impart upward swinging movement of the a boom relative to said bumper and whereby a load suspended from said top end of the boom may be lowered onto or lifted from the body of a vehicle to which said bumper is secured.

References Cited in the file of this patent V UNITED STATES PATENTS 

1. A HOIST OF THE CHARACTER DESCRIBED, COMPRISING IN COMBINATION, A TURRET, A VERTICALLY DISPOSED SLEEVE BEARING MOUNTING SAID TURRET TO FLANGES OF A VEHICLE BUMPER OF CHANNEL SECTION, A PIVOT SHAFT JOURNALLED IN SAID SLEEVE BEARING AND EXTENDING UPWARDLY THROUGH SAID TURRET, A BOOM PIVOT PLATE SECURED AT ONE OF ITS ENDS TO SAID PIVOT SHAFT FOR ROTATION THEREWITH, A BOOM OF GENERALLY ARCUATE SHAPE IN SIDE ELEVATION AND HAVING A TOP END AND A BOTTOM END, MEANS HINGEDLY MOUNTING THE BOTTOM END OF THE BOOM TO SAID BOOM PIVOT PLATE, A JACK, MEANS REMOVABLY SUPPORTING SAID JACK ON SAID BOOM NEAR SAID BOTTOM END THEREOF IN OFFSET RELATION THERETO AND TO SAID HINGED BOOM MOUNTING MEANS, A RAM OPERABLE BY SAID JACK, 